Transactions of Materials and Heat Treatment

Title：Influence of RE on tensile and impact properties for hot rolled steel SA516Gr70 by vacuum induction melting

Authors： Wu Lifan Li Tao

Unit： Baotou Iron & Steel Polytechnic Inner Mongolia University of Science and Technology

KeyWords： rare earth element SA516Gr70 steel tensile property impact property mechanical property

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2021,46(11):255-259

Abstract：

In order to improve the mechanical properties of structural steel SA516Gr70, its mechanical strength was improved by adding rare earth element RE (the mass fractions of 0%, 0.006% and 0.012%), and the differences in tensile and impact properties of steel specimens prepared under three groups of different conditions were compared by means of experimental test. The results show that the ferrite and pearlite are the main components in the samples. After RE is added, more equiaxed grain structures are formed in the central region, which reduces the grain size and improves the mechanical strength of SA516Gr70 steel, and RE-type inclusions can become heterogeneous nucleation points of α-Fe phase to produce SA516Gr70 steel composed of finer grains. In addition, adding RE into steel can make SA516Gr70 steel obtain higher tensile strength and impact resistance. When the amount of RE is added to 0.012%, the tensile strength and yield strength of steel increase to 592 and 516 MPa respectively, and the impact absorption energies increase by 8.3% at -40 ℃ and 13.8% at -60 ℃. With the increasing of RE, the depth of fracture dimple also increases significantly, which shows obvious ductile fracture to result in obvious plastic deformation.

Funds：

内蒙古自然科学基金资助项目（2019MS05054）

作者简介：吴立凡（1974-），女，硕士，高级讲师，E-mail：wulifan20909@163.com

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